Merge staging to production

This adds the BTWF_animated_gif project to the production branch, as well as a few project fixes, updating the project listing page with some older projects (not BTWF) and changing from `cmcavoy/webmaker-nav` to `mozilla/webmaker-nav`. 

MoCo staging bug was: https://bugzilla.mozilla.org/show_bug.cgi?id=834809